Question

24. In mammals, urine formation occurs in a pair of kidneys. Each human kidney contains about a million tubelike-

blood-filtering units called nephrons. Urine compositions and volume depend on three processes: filtration, reabsorption, and secretion.

Which of the following does not match the process named?

a. filtration: blood enters Bowman's capsule of glomerulus

b. reabsorption: water and solutes selectively return to

blood capillaries

c. secretion: excess ions and some other substances move

from blood capillaries into the nephrons

d. all of the above match

25. Multicellular animals have a circulatory system consisting of a muscular pump, blood and blood vessels; it

exchanges substances with interstitial fluid only in diffusion zones. Blood, transport fluid, carries oxygen and

other substances to cells. Which of the following are NOT components of blood?

a. red blood cells and white blood cells

b. assorted solutes and dissolved gases

c. platelets and plasma

d. none of the preceding

26. The contents of the stomach changes from an acid pH towards an alkaline pH as they enter the small intestine.

This change is caused by:

a. neutralization of amino acids

b. the removal of hydrogen ions in reaction with salt in the

intestinal secretion

c. a decrease in the secretion of HCl in the stomach

d. the digestion of acid molecules by enzymes in the small

intestine

27. A woman had several miscarriages. Her doctor suspected that a hormonal insufficiency was causing the

lining of the uterus to break down, as it does during menstruation, terminating her pregnancies. Treatment

with which of the ff. might help her to remain pregnant?

a. oxytocin c. adrenal cortex

b. testosterone d. luteinizing hormone

Answer 1

Question 24:

Correct answer: option d

Rational:

Option a, b,c are exactly explaining functions of kidneys and its matching each other. So options d is correct.

Question 25

Correct answer: option d

Rational

Blood coantains RBC, WBC, platelet, plasma, solutes, dissolved gases. Do option a, b, c all are presents in blood. So option is correct.

Question 26

Correct answer: option d

Rational

In stomach ph is acidic, when it enter into small intestine it mixes with bile. This bile makes the intestine as alkaline. So option d is correct, other options are incorrect.

Question 27

Correct answer: option d

Rational:

Leutinising hormones helps to trigger evaluation and development of corpus leuteum.

So option d is correct, other options are incorrect.